Its use in a low church service certainly would (7)
I believe the answer is:
incense
'would' is the definition.
Although both the answer and definition are verbs in their base form, I don't understand how they can define each other.
'its use in a low church service certainly' is the wordplay.
I cannot quite understand how this works, but
'in' is found in the answer.
'church' could be 'ce' (abbreviation for Church of England) and 'ce' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for incense that I've seen before include "Provoke" , "It produces a fragrant odour when burnt" , "Make very angry about the fragrant smoke?" , "Material with fragrant fumes" , "Perfume, make angry" .)